What I’ve found is that it tends to happen more on dialogs and cut scenes that are skipped through. If you press A or skip through a cutscene at the wrong time (no idea how to tell when a bad time is) it will de sync the entire dialog and from then out you just get characters bobbing their heads as if they were saying something but not actually speaking. Luckily it seems to stop happening for me on the next cutscene if I let it play through the entire way unskipped.